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Finding the Fourth Proportional to 1,313.76, 1,813.01 and 870.87

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Solution

The fourth proportional to 1,313.76, 1,813.01 and 870.87 is: 1,201.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.76 : 1,813.01 = 870.87 : x
  2. Step 2: Convert to fraction form
    1,313.76/1,813.01 = 870.87/x
  3. Step 3: Cross multiply
    1,313.76x = 1,813.01 × 870.87
  4. Step 4: Simplify right side
    1,313.76x = 1,578,891.66
  5. Step 5: Solve for x
    x = 1,578,891.66/1,313.76
  6. Step 6: Final answer
    x = 1,201.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.